Malvern Mastersizer 3000 Manual

Maintenanc e
76
Clean the sample tank
If the dispersant type is changed, or if sample is seen to adhere to the
sample tank and the normal flush routine fails to remove it
Replace the dispersant
pipe
If the dispersant pipe leaks or becomes discolored. This may allow
bubbles to enter, causing rapid fluctuations in the background.
Perform a Quality Audit
Standard measurement
At least once a week or as internal quality procedures specify.
Hydro EV
Procedure Period/situation
Inspect cell windows for
dirt and scratches
The cell windows should be checked for general cleanliness every day.
They should also be checked if either of these are seen during a back-
ground measurement:
l One of the first few detectors displays a value above 100 light
energy units.
l Background signal over 20 light energy units recorded by one of
the detectors above detector 20 (see below).
Either of these situations would indicate a poor background; this will
effect the quality of any measurements.
Check the window seals
for damage
At least once a month. Always watch for signs of leaks and rectify imme-
diately.
Clean the covers
Once a month.
Clean the sample flow
path
Contamination by coarse particles or bubbles in the dispersant may
cause fluctuations in the background. Clean the sample path with the
clean options.
Inspect and clean the
sample pump head
If the dispersant type is changed, or if sample is seen to adhere to the
sample tank and the normal flush routine fails to remove it
Replace the dispersant
pipe
If the dispersant pipe leaks or becomes discolored. This may allow
bubbles to enter, causing rapid fluctuations in the background.
Perform a Quality Audit
Standard measurement
At least once a week or as internal quality procedures specify.
Hydro SM
Procedure Period/situation
Inspect cell windows for
dirt and scratches
The cell windows should be checked for general cleanliness every day.
They should also be checked if either of these are seen during a back-

Malvern Mastersizer 3000 Specifications

General

Measurement principle	Laser diffraction
Blue laser wavelength	470 nm
Sample dispersion options	Wet and dry dispersion
Data acquisition rate	10 kHz
Particle size range	0.01 to 3500 microns
Laser type	He-Ne and solid state
Accuracy	Better than 1%
Repeatability	Better than 0.5%
Technology	Mie and Fraunhofer theories
Sample dispersion units	Hydro MV, Hydro LV, Aero S
Optical model	Mie theory
Power requirements	100-240 V, 50/60 Hz
Detector arrangement	Log-spaced array